As a credo-baptist, I tend to think most paedo-baptists are inordinately reliant on the Old Testament, particularly overemphasizing continuity or reading continuity where there isn’t meant to be continuity. But it could be worse.
Eastern Orthodoxy is inordinately reliant on a 12th-century Byzantine cultural interpretation of Christianity. Just like some fundies got stuck in the fifties? Orthodox got stuck in the 1150s.